Feeding device



Jall- 1931- w., A. SMITH, SR 7 1,788,034

FEEDING DEVICE Filed Feb. 11. 1950 JNVENTOR.

- 1/15 ATTORNEY Patented Jan. 6, 1931 oFFICE YLVANIA, A SSIG NO R TO INGERSOLL-R-AND EY, A CORPORATION OF NEW JERSEY EEEmNe DEvIcE i Application filed February 11, 1930., Serial 0,427, 1

This invention relates to feeding devices, but more particularly to a device of this character adapted for actuating a percussive motor relatively to its support.

One object ofthe invention is to force ofthe reciprocatory piston of the motor for moving the motor relatively to the support.

Another object is to prevent recoil of the 1p motorupon the reversal of the piston at the end of one stroke and to enable the motor to bemoved along the support by the jar imparted by the piston upon the reversal of the piston at the end of the opposite stroke.

Other objects will be in part obvious and in part pointed out hereinafter.

1n the. accompanymg drawings illustrating the invent on and in which similar refe'rence characters refer to similar parts, a

Figure 1 is a plan view of a portion of the motor and its support having the invention applied thereto, a Figure 2' is an elevation, partly in section, taken through Figure 1 on the line 2 2-looking in the direction indicatedby the arrows, Figure 3 is an elevation, partly in section,

' taken through Figure 2 ontheline 3-,8 looking in the direction indicated by the arrows, and j Figure 4' is an elevat on, partly in section,

taken through Figure 1 on the line H1001:-

ing in the direction indicated by the/arrows.

Referring more particularly tothe drawings,A designates amotor Whicl1, in:this instance, is illustrated as a portion of a rock drill, and B is a support Whereon the motor Aniay be slidably mountedto enable the said motor to be advan'cedto the work and re tracte'd therefrom. ,7 r i I "The motor A comprises the usual cylinder B adapted to accommodate a piston C of the recip'rocatory hammer type usually employed for delivering blows of impact to a working implement, such as a drill steel (not shown). v Secured to the rear end of the cylinder B, as by means of side rods orboltsl), is a back head 15 toform a closure'for the rear end of the cylinder B and to form fa housing for a throttle valve F whereby the admissio-n of 1 pressure fluid into the motor A-may be'conautomatically utilize the trolled, The motor A may be provided with suitableya'lve mechanism "(not shown) for effecting the distribution of pressure fluid to'thecylinder B.

In accordance with th'e present invention, meansare provided'for enabling the motor A tobe moved longitudinally of the support B by the jar imparted to the motor by the piston C'upon the reversal of the said piston at.- the ends of-its strokes. The means provided for this purpose comprises a stationary orfixed member in the form of a rod G which may be suitably supported at its ends by the sup portBfi- I 1 i The rear end of theorodjG is preferably secure'dto across head H 'which in turnis supported by standards J extending rearwardly ofthe support B. The'stan'dardsJ may be in the form of bolts secured to the rear end of the support B and=having sleeves thereon which abut the support B and the cross head H for holding the said cross head in spaced relation with respect to the support- B. l v

Secured to the back head E as by means of the side rods D is a bracket L whereon is pivotally mounted a friction shoe- 0. The friction shoe Ois adaptedto be moved into different positions of frictional engagement with therod G and is preferably arranged approximately laterally with respect to the rod G. In theend of the friction shoeadjacent the rodG is a groove'Pof a shape to conform o substantially to the surface of the rod Gr. When used in connection with a cylindrical rod, such as that illustrated, the groove P may be of partly circular form and the rear and front edges Q, and B respectively of the groove P constitute gripping edges which, in certain positions of the friction shoe 0, engage the rod G. V

In order to actuate the friction shoe into frictional engagement with the rod G, the bracket L is provided with a pair of cylinders S and T disposed'forwardly and 'rearwardly respectively of the friction shoe 0. The cyl inders S and T may be secured tothe'bracket in any suitable manner, as for instance, by bolts U, and are provided with chambers V to accommodate plungers W and X, the plunger W being disposed within the cylinders and the plunger X in the cylinder T.

The movement of the plungers W and X is affected by means of pressure fluid and such pressure fluid is conveyed to the outer or closed ends of the cylinders by inlet passages Y which-communicate with-a valve chamber 1 valve (Z in the end of which extends exteriorly of the Z in a valve chest I; attached to the side of the bracket L and secured thereto by bolts 0.

' Within the valve chamber Z is a throttle shape of a tapered plug, one valve chest 6 to receive a Wing lever 6 whereby the throttle valve maybe manipulated. I

The throttle valve (Z has a recess fin its inher end to which pressure fluid is supplied by a supply passage L 'WlllChiS formed" in the bracketL and is controlled by the throttle '39 cess f and is adapted to register with the supvalve F. Inthewallof-the throttle valve cl is a port .g/ which communicates with there ply passages Y.

- In the periphery of the throttle valve d is I a" groove is to establish communication betweenthe port 9 and the supplypassages. The groove his .of such extentthat it may only afiord communication between the port g and one. or the other o'f the supply passages Y. In the same transverse plane as the groove '70 is asecond groove owhic'h' is of such extent thatv it may simultaneously establish communication between both of the supply passages Y andan exhaust port 79 in the valve "chest band leading to the atmosphere.

To the end that'the rod G-Inay be suitably supported intermediate its ends and more which the rod G of the particularly at-the-point atfwhiich the friction shoe 0 acts against the said rod, the

bracket L is provided with a suitable bearingportion 9 which has a bore 0" through extends. The bore 1' may, as shown, be of larger diameter than-the rod T to receive a bushing swhich serves as a renewable bearing surface for the rod G.'

The bore twithin. the bushing a is only of sufliciently larger diameter than the-rod G to permit said bushingto pass freely over the surface of the rod without causing undue frictionbetweenthese elements. v

Thebnshing 8 may be secured in the as sembled position in any suitable manner as for instance, by means of a nut u-which is threaded on a rearwardly projecting end 12 bushingand acts against the corresponding end of the bearing 9. On the front end of the bushing s is a head 20 which seats against the front end of-the bearing Q'.

' The operation ofthedevice is as follows: Let it be assumed: that the'motor. A is 111 operation so that-the hammer piston '1) dc;

livers its blows totheiworking implement intended to'jbeactuatec'l. Then the motor A is thus. operating it is, of course, essential thatitbe actuated.longitudinally of the supp rtiB in the directi n o the ork etha the full force of the hammer piston may be effectively applied to the working implement for driving the said working implement into the work. 7

In order to constantly maintain the motor inithe orrect operative position with respefzt to the working implement, the friction shoe 0 should occupy a position substantially like that illustrated in Figure 2 in which the gripping edge bears against the rod G. To the end that the friction shoe 0 may be maintained in this position, the throttle valve (Z is rotated so that pressure fluid may flow through the rear supply passage Y into the piston chamber V of the cyinder T. V V

' Pressure. fluid thus admitted will act against the plunger X to rock the friction shoe 0 forwardly so that when the hammer pistonC reverses itsdirection at the end of its rearward stroke, the jar resulting from t such reversal will cause the gripping edge Q to tightly grip the rod G. The motor A will therefore be prevented from recoiling from the work.

As the piston C reaches the end of its forward stroke the jar resulting from the act of reversal of the piston will carry the motor A forwardly along the support 13 for a depending upon the degree.

' slight distance of penetration of the working implement into the work. From this point on the cycle of operations may be repeated. Upon each forward strokeof the piston C, the motor A will "be advanced a slight distance so that the said motor may at all times be maintained in the proper operative position for assuring the maximum efiect of the blows of thehammer piston C, and during each rearward stroke of the piston C, the motor A will be held against edgeQ of the friction shoe 0. In other words, the'gri'pping edge Q will alternately grip and release the rod G, the effect of t 1i action of the friction shoe 0 being that the the work at a speed which will-assure the best drilling results. 1

V c When the motorjA approaches the foremost limit of its travel with respect to the support B, the throttle valve d may be rotated to a position for admitting pressure'fluid into the pistonchamber V of the cylinder S. In this recoil by the gripping motor A will be gradually advanced towards rearward travel on the support, the throttle largely to the valve (Z may be rotated to a position in which the groove 0 will establish communication be-- tween both supply passages Y and the exhaust port p. At the same time the throttle valve d may pressure fluid to the motor A and also to out ofi the flow of pressure fluid to the passage L.

As will be readily apparent, by placing the throttle valve (Z in the neutral position illustrated in Figure 4 in which only atmospheric pressure exists in both the cylinders S and T the friction shoe 0 ispermitted to also assume a neutral position in which neither of the gripping edges R orQ will be effective to interfere with the free-movement of the motor A on its support. This isxdesirable in many instances, particularly when drilling horizontal holes, for the reason that it enables the motor to be readily moved along its support by the operator.

The present invention has been found to be unusually efficient in practice. This isdue fact that the percussive elements, such as the motor A, may at all times be maintained in theproper operative position with respect to the implement which it is intended to actuate. A maximum effect of the blows of the hammer piston will therefore be obtained.

Another very desirable feature of the present invention is that while the feeding means assures a proper advancement ofthe motor relatively to its support, it does not actuate the motor in the direction of the work with such undue force as to interfere with the proper operation of the motor, particularly in the case of rock drills ofthe drifter type having rotation mechanism for rotating the working implement.

I claim:

1. In a feeding device, the combination be closed to both out ofi the supply of.

said friction means into different tl1e[l1arnnierpiston to advance andretract the motor'relatively to the support.

2 In a feeding device, the combination with a motor and a support whereon said motor is slidabl mounted areciorocator hammer piston in'the motor imparting jars thereto tendingto move the motor longitudr nally of the support, of a fixed member, means adapted to engage thefiXed member, and

pressure fluid actuated means for actuating the first said means into frictional engagement with the fixed member, thereby prevent- 'lilg recoil ofthe motor upon reversal of the piston at the end of one stroke and permitting the motor to be moved' along the support by the piston upon reversal of the piston at the end ofits opposite stroke.

V In a feeding device, the -combination with a motor anda support whereon said motoris slidably mounted, alreciprocatory hammer piston in the .motor imparting ars thereto for moving tlie motor: longitudinally of't-hc'support, of a stationary member eX-' tending longitudinally of'the support, a'movable member carried by the motor and adapted to friction-ally engage the stationary member for preventing recoil of the motor, and pressure'fiuid actuated. means to press the movable member selectively into different positions for frictionaily engaging the"sta tionary member, thereby enabling the ham mer pistonto advance and retract the motor relatively to the support.

tor is slidably mounted, a reciprccatory hammer'piston *in the motor imparting engagethe fixed member, a plurality of pros sure-fluid actuated means acting on opposite sides of the friction means for actuating the engaging positions, and a valve' for contr lling the flow ofpressure fluid tothe pressure actuated means. I v

i 5. In a feeding device, the combination with a motor and a support whereon said motor is slidably mounted, a rciprocatory hammer piston inthe motor impar are thereto for moving the motor longitudinally of the support, of a rod affixed to thesupport, a friction shoe-carriedby the motor and adapt- .to-frictionally engage the rod for preventinglrecoil' of'the motor, fluid actuated plungers acting on opposite sides of the friction shoezfor actuating said friction shoe into different engaging positions,and a valve for selectively controlling the flow of presa. In a feeding device, the combination with a motor and a support whereon said mothereto for actuating the motor longitudinally of the support, of a stationary rod extending longitudinally of the support, a friction shoe pivotally connected to the motor and adapted to frietionally engage the rod for preventing recoil of the motor, fluid actuated plungers' adapted to act selectively against opposite sides of the friction shoe to press I said friction shoe into different positions for engaging the rod, thereby enabling the ham- .ier piston to advance and retract the motor relatively to the support, and a valve for controlling'the flow of pressure fluid to and from the plungers.

7. In a feeding device, the combination With a motor and a support Whereon said motor is slidably mounted, areci-procatory hammer piston in the motor impartingjars thereto for actuating said motor relatively to the support, of a stationary rod extending;

longitudinally of the support, a bracket carried by the motor andhaving Which the rod extends, a friction shoe pivoted on the bracket for frictionally engaging the rod, cylinders on the bracket and arranged on opposite sides of. the friction shoe, V

plungers in the cylinders for pressing the .friction shoe into difierent positions of engagement With the rod for preventing recoil of the motor, thereby enabling the motor to .v i v be advanced and retracted on the support by the piston, passages in the bracket for conveying pres-sure fluid from a source to the cyl- V inders, and a valve for controlling the passages to selectively admit pressure fluid into the cylinders.

8. In a feeding device, the combination With a motor and a support'where'onsaid motor is slidably mounted, a reciprocatory harnmer piston in the motor imparting jars thereto for actuating said motor relativelyto the support, of a rodjsupported at its ends by the supportand extending longitudinally thereof, a bracket carried by the motor, a bushing carried by the bracket and forming a movable V support for the rod intermediate the ends of the rod, a friction shoe, pivoted on the cylinders on the bracket and disposed on the opposite sides of the friction shoe, plungers in the cylinder for pressing the friction shoe into different positions of engagement With the rod to prevent recoil of the motor, there- 7 by enabling the motor to be advanced and retracted on the support by the piston, passages in'the bracket for conveying pressure fluid to the cylinders to actuate the plungers, and a throttle valve for selectively controllingthe flow of pressure fluid to and from the cylinders. v v

In testimony whereof I have signed this specification.

WI LIA SMITH, SR.

a bore through a 

